THE LIZARD AND ITS ALLIES 



278 



sometimes over 10 metres long, and had feet modified 

 as paddles. The land lizards were elongated, three-toed, 

 carnivorous reptiles, with hollow leg bones like birds. In 

 the flying lizards, a strong compact body was provided 

 with hollow, air-filled bones, and locomotion was effected 

 by a huge membranous expanse stretched between the 



FIG. 255. Hadrosaurus. From reconstruction model. Osborn, " Kept. 

 Amer. Mus. Nat. Hist." 



elongated posterior finger, the trunk, and the hind legs. 

 The spread of the wing was about three feet. 



The Chelonia, 1 or turtles, form an order distinct from 

 the lizards. , They are characterized by a depressed form, 

 a bony case, and toothless jaws. Like other reptiles, they 

 are most abundant in tropical countries, since the high 



i/r/, turtle. 



